Analyzing User Profiles

1. A method performed by one or more processing devices, the method comprising: identifying websites with which users of a social networking service have established an affiliation; filtering the identified websites by removing websites in which a count of users who have established an affiliation with the website exceeds a threshold, the filtering producing a plurality of filtered websites; producing a list of valid affiliations for each filtered website, comprising: generating a validity score for each of the established affiliations with the respective filtered website, determining whether each of the established affiliations with the respective filtered website is valid based on the corresponding validity score, and ranking the users who established valid affiliations with the respective filtered website based on the corresponding validity scores; and providing the list of the valid affiliations ordered by the ranking.

2. The method of claim 1 , wherein identifying the websites comprises identifying a link to a website on a profile of a user of the social networking service.

3. The method of claim 1 , wherein identifying the websites comprises identifying link to a website on posts generated by a user of the social networking service.

4. The method of claim 1 , wherein identifying the websites comprises identifying, on at least a portion of a website, information relating to a user of the social networking service.

5. The method of claim 1 , wherein generating the validity score comprises determining a number of times a respective user links to the respective filtered website on a profile of the respective user.

6. The method of claim 1 , wherein generating the validity score comprises determining a number of times a respective user links to the respective filtered website on posts generated by the respective user.

7. The method of claim 1 , wherein generating the validity score comprises determining a ratio of a number of times a respective user links to the respective filtered website compared to a number of times the respective user links to other websites.

8. The method of claim 1 , wherein generating the validity score comprises determining a user quality score, the user quality score based on a popularity of a corresponding user.

9. The method of claim 8 , wherein generating the validity score comprises determining a site quality score.

10. The method of claim 9 , wherein determining whether the affiliation is valid comprises determining whether the user quality score is within a threshold amount of the site quality score.

11. A system comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: identifying websites with which users of a social networking service have established an affiliation; filtering the identified websites by removing websites in which a count of users who have established an affiliation with the website exceeds a threshold, the filtering producing a plurality of filtered websites; producing a list of valid affiliations for each filtered website, comprising: generating a validity score for each of the established affiliations with the respective filtered website, determining whether each of the established affiliations with the respective filtered website is valid based on the corresponding validity score, and ranking the users who established valid affiliations with the respective filtered website based on the corresponding validity scores; and providing the list of the valid affiliations ordered by the ranking.

12. The system of claim 11 , wherein identifying the websites comprises identifying a link to a website on a profile of a user of the social networking service.

13. The system of claim 11 , wherein identifying the websites comprises identifying link to a website on posts generated by a user of the social networking service.

14. The system of claim 11 , wherein identifying the websites comprises identifying, on at least a portion of a website, information relating to a user of the social networking service.

15. The system of claim 11 , wherein generating the validity score comprises determining a number of times a respective user links to the respective filtered website on a profile of the respective user.

16. The system of claim 11 , wherein generating the validity score comprises determining a number of times a respective user links to the respective filtered website on posts generated by the respective user.

17. The system of claim 11 , wherein generating the validity score comprises determining a ratio of a number of times a respective user links to the respective filtered website compared to a number of times the respective user links to other websites.

18. The system of claim 11 , wherein generating the validity score comprises determining a user quality score, the user quality score based on a popularity of a corresponding user.

19. The system of claim 18 , wherein generating the validity score comprises determining a site quality score.

20. The system of claim 19 , wherein determining whether the affiliation is valid comprises determining whether the user quality score is within a threshold amount of the site quality score.

21. A computer-readable medium encoded with computer program instructions that when executed by one or more computers cause the one or more computers to perform operations comprising: identifying websites with which users of a social networking service have established an affiliation; filtering the identified websites by removing websites in which a count of users who have established an affiliation with the website exceeds a threshold, the filtering producing a plurality of filtered websites; producing a list of valid affiliations for each filtered website, comprising: generating a validity score for each of the established affiliations with the respective filtered website, determining whether each of the established affiliations with the respective filtered website is valid based on the corresponding validity score, and ranking the users who established valid affiliations with the respective filtered website based on the corresponding validity scores; and providing the list of the valid affiliations ordered by the ranking.